Update: Iran launched a missile attack on the U.S. base at Al Udeid in Qatar on Monday. No casualties were reported. The shelter in place warning has now been lifted. Read the latest here.The U.S. Embassy in Qatar warned American citizens on Monday to shelter in place,

Qatar said on Monday it had shut down its airspace temporarily, hours after U.S. and British authorities contacted their citizens there recommending that they shelter in place until further notice. The U.

Qatar suspended air traffic on Monday after the US and UK governments told citizens based in the Gulf state to shelter in place, amid fears that Iran will target US military assets in retaliation for strikes on its nuclear facilities.